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Message: [QUOTE="TARM, post: 423478, member: 578"] Sound like you a fuel volume issue. If everything was GTG before you installed the tank and filter kit then I think this gives you are really good place to start. Check your filter head first. See if you actually have the hoses hooked up correctly based on the arrows on the filter head. IIRC Dennis uses a 4 port head unit. It should have come with at least 2 plugs. Each side has a port for flow in each direction. I have seen a fair number of people get this backwards as they think the flow direction is the same for both ports on each side. I have seen people get the hook up on the tank sending unit wrong and hook the return to the feed tube and the feed to the return. Make sure the none of the hoses got pinched when you reinstalled the tank. Since everything was working fine after the RR for now we can assume it was all GTG. The way to test fuel flow rate @ a given pressure without having to install a in cab gauge as that still does not actually give you a rate: Pull the return line that going to the tank. Not sure how your kit is setup with bowl or bowl delete. Just pull the line from either the fuel bowl or the regulator that ends up going back to the tank. Put a hose on that you can dump into a 5 gal bucket. Put some measurement lines on the bucket for 1-4 gals. Start the vehicle up and time how long it takes to get a specific number of gals into the bucket. That will allow you to calculate the gph flow rate @ the 62 psi.. Should be 20 gph range or you should take 3 mins or less to put out a gallon into the bucket. There is such little fuel used at idle it should be a non-factor. Since the stock pump circuit cuts off after 30 sec if the engine is not running its easier to just do it running than the change up the wiring IMO. Now the bosch pumps have a thermal overload circuit so if they get overheated they will go to a very reduced flow rate until the temp comes down. The real is if the siutation is causing cavitation its going to chew up that pump. Not that they are overly costly but still. [/QUOTE]